. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. AEROGRAPHER'S MATE 3 & 2. Figure 11-11.—Isallobars. Weather Analysis A thorough study of the weather on the sur- face chart has been made as the map has been analyzed. It is now time to indicate the inten- sity and characteristics of the precipitation and of some of the other weather phenomena. This is done by shading and/or use of symbols as shown in table 11-1. Movement Analysis The next step is to determine the present rate of motion of the fronts and pressure sys- tems. The past rate of motion is al
. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. AEROGRAPHER'S MATE 3 & 2. Figure 11-11.—Isallobars. Weather Analysis A thorough study of the weather on the sur- face chart has been made as the map has been analyzed. It is now time to indicate the inten- sity and characteristics of the precipitation and of some of the other weather phenomena. This is done by shading and/or use of symbols as shown in table 11-1. Movement Analysis The next step is to determine the present rate of motion of the fronts and pressure sys- tems. The past rate of motion is already indi- cated from the past history of the pressure systems and the fronts. After the past and pre- sent motions of fronts and pressure systems are determined, their future movement is considered. It is standard procedure in weather offices to place the expected movement of pressure systems and fronts on the current weather chart. (See fig. 11-12.) Two of the primary methods for determining movement of these systems are by their move- ment on previous charts and by the pressure tendencies on the current chart. For example, the low in figure 11-12 the position for each 12-hour period is noted and placed on the chart. If the 1200Z chart for the ninth day of the month is being analyzed and a low-pressure system is located at position 3, and on the previous 12-hour charts it was located at positions 1 and 2, it could be assumed that 12 hours hence the system would be at position 4. High-pressure areas move toward areas of positive pressure tendencies; low-pressure areas move toward areas of negative pressure tenden- cies. Summary The following summary is the recommended procedure for analyzing a surface weather map: 1. Draw the fronts and pressure systems of the preceding map on the current chart with a yellow pencil. Study the previous charts for historical sequence. 2. Sketch the isobars lightly, preferably one pressure system at a time. Isobars should be adjusted (fig. 11-
Size: 1515px × 1650px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectmeteorology, booksubjectunitedstates
